You may be able to get him in Berkeley today. In a list of my top candidates to present at a Future Salon he would be in the top 5 and it almost happened earlier this year when the limit on campaign financing by corporations was eliminated by the supreme court. We were planning to do a Future Salon around that theme of corporate personhood, but his travel plans changed so it never happened. The bummer is, that none of the above talks are webcasted, even though it would be really interesting to hear what Lawrence has to say about the Occupy Wall Street movement. A couple of searches later, here is what he has to say:

Digging a bit deeper another clip of Lawrence Lessig addressing Occupy Wall Street, where you can also hear the human megaphone in action: